From: "Tomas Härdin" <tjoppen@acc.umu.se>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 2/2] avcodec/smacker: Optimize constant 16bit audio output
Date: Wed, 06 Jul 2022 20:26:12 +0200
Message-ID: <d728f067710a58a2ebbcbc954f58195332aff1bd.camel@acc.umu.se> (raw)
In-Reply-To: <20220706171121.GO396728@pb2>
ons 2022-07-06 klockan 19:11 +0200 skrev Michael Niedermayer:
> On Wed, May 04, 2022 at 11:39:54AM +0200, Tomas Härdin wrote:
> > tis 2022-05-03 klockan 18:30 +0200 skrev Michael Niedermayer:
> > >
> > > + } else if (stereo) {
> > > + val = 256*values[1] + values[0];
> > > + val2 = 256*values[3] + values[2];
> > > + for(; i < unp_size; i+=2) {
> > > + pred[0] += val;
> > > + pred[1] += val2;
> > > + *samples++ = pred[0];
> > > + *samples++ = pred[1];
> > > + }
> > > + } else {
> > > + val = 256*values[1] + values[0];
> > > + for(; i < unp_size; i++) {
> > > + pred[0] += val;
> > > + *samples++ = pred[0];
> > > + }
> > > + }
> >
> > Got any numbers on how much faster this is? Just out of curiosity
>
> With the fuzzed sample:
> before:
> 3263902379 decicycles in ABBB, 128 runs, 0 skips
>
> after:
> 398977744 decicycles in ABBB, 1024 runs, 0 skips
>
> the first times out after 128 runs which is why the runs differ
Cool. Well, looks good
/Tomas
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next prev parent reply other threads:[~2022-07-06 18:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-03 16:30 [FFmpeg-devel] [PATCH 1/2] tools/target_dec_fuzzer: Adjust threshold for smacker audio Michael Niedermayer
2022-05-03 16:30 ` [FFmpeg-devel] [PATCH 2/2] avcodec/smacker: Optimize constant 16bit audio output Michael Niedermayer
2022-05-04 9:39 ` Tomas Härdin
2022-07-06 17:11 ` Michael Niedermayer
2022-07-06 17:18 ` Paul B Mahol
2022-07-07 18:24 ` Michael Niedermayer
2022-07-06 18:26 ` Tomas Härdin [this message]
2022-07-07 18:24 ` [FFmpeg-devel] [PATCH 1/2] tools/target_dec_fuzzer: Adjust threshold for smacker audio Michael Niedermayer
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